Standard Adjustments; Adjusting The Needle Bar Height; Adjusting The Needle And Looper Timing - Brother BM-917B Instruction Manual

12. STANDARD ADJUSTMENTS

Maintenance and inspection of the sewing machine
should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to
carry out any maintenance and inspection of the
electrical system.
Turn off the power switch and disconnect the power
cord from the wall outlet at the following times. The
machine may operate if the pedal is pressed by
mistake, which could result in injury.
When carrying out inspection, adjustment and
!
maintenance
When replacing consumable parts such as the
!
loopers and knife
* The motor will keep turning even after the power
is switched off as a result of the motor's inertia.
Wait until the motor stops fully before starting
work.

12-1. Adjusting the needle bar height

12-2. Adjusting the needle and looper timing

CAUTION
When turning the machine pulley by hand, turn the
pulley until the needle is at the final position after one
cycle.
If the needle is at a point midway through the cycle
when the power is turned on, the machine will
immediately start operating, which could result in
injury.
If the power switch needs to be left on when carrying
out some adjustment, be extremely careful to
observe all safety precautions.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly
before using the machine.
Adjust so that reference line (a) on the needle bar (1) is
aligned with the bottom edge of needle bar bush D (2) when
the needle bar (1) is at its lowest position.
* If using a TQx7 needle, adjust by aligning reference line
(c).
1. Turn the machine pulley to set the needle bar (1) to its
lowest position.
2. Loosen the screw of the needle bar clamp (3) by inserting
a screwdriver through the hole in the face plate, and then
move the needle bar (1) up or down to adjust the height.
3. Tighten the screw of the needle bar clamp (3).
2005M
Adjust so that the tip of the looper (3) is aligned with the
center of the needle when the needle bar (1) rises from its
lowest position until reference line (b) of the needle bar (1) is
aligned with the bottom edge of needle bar bush D (2).
* If using a TQx7 needle, adjust by aligning reference line
(d).
1. Loosen the two set screws (4), and then turn the looper
setting shaft (5) to adjust the timing.
2. Tighten the set screws (4).
2006M
BM-917B, 917C
12. STANDARD ADJUSTMENTS
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